The Sennheiser CHG 1-Kit-EU contains all the components you need to let your wireless transmitter or receiver from the Evolution Wireless series operate on rechargeable batteries. This kit contains a BA2015 rechargeable battery, an LA 2 charging adapter, an L2015 charger and a NT1-1 power supply. No more trips to the battery-recycling bin, thanks to this kit, which also means that it is environmentally friendly!